In late December, the Centers for Disease Control and Prevention (CDC) announced that it would conduct a briefing on January 16 regarding the “public health response to a nuclear detonation” over the skies of the United States. Now, the CDC has canceled the nuclear briefing and focused on something much more important: the flu epidemic across the continental United States.

The agency announced the switch in topics late Friday, citing the ‘out of control’ flu cases as the main reason for the shift.